Signal receiving apparatus

Abstract

A signal receiving apparatus includes a receiving circuit board having a signal receiving circuit formed on one side of an insulating substrate, a wide conductive pattern formed on the other side of the insulating substrate that faces a forming position of the signal receiving circuit, and a printed radiating conductor formed on the other side of the insulating substrate deviated from a position that faces the forming position of the signal receiving circuit. In the signal receiving apparatus, an input stage of the signal receiving circuit, an output stage of the printed radiating conductor, and the wide conductive pattern are conductively connected on the receiving circuit board, and received signals are supplied to the signal receiving circuit, by using the printed radiating conductor and the wide conductive pattern as an antenna, through a conductive connection point thereof.

1. A signal receiving apparatus comprising:
 a receiving circuit board having a signal receiving circuit formed on one side of an insulating substrate, a wide conductive pattern formed on another side of the insulating substrate that faces a forming position of the signal receiving circuit, and a printed radiating conductor formed on the another side of the insulating substrate deviated from a position that faces the forming position of the signal receiving circuit, 
 wherein an input stage of the signal receiving circuit, an output stage of the printed radiating conductor, and the wide conductive pattern are conductively connected on the receiving circuit board, and 
 received signals are supplied to the signal receiving circuit, by using the printed radiating conductor and the wide conductive pattern as an antenna, through a conductive connection point thereof. 
 
     
     
       2. The signal receiving apparatus according to  claim 1 ,
 wherein, in the receiving circuit board, a surface acoustic wave (SAW) filter is arranged on the one side of the insulating substrate, and 
 one end of the SAW filter is connected to the output stage of the printed radiating conductor and another end of the SAW filter is connected to the input stage of the signal receiving circuit, respectively. 
 
     
     
       3. The signal receiving apparatus according to  claim 1 ,
 wherein, in the receiving circuit board, a plurality of filter elements are arranged on another side of the insulating substrate, 
 one of the plurality of filter elements is connected between an external ground terminal and the conductive pattern, and 
 the remaining filter elements of the plurality of filter elements are arranged between corresponding external connection terminals and corresponding connection ends of the signal receiving circuit, respectively. 
 
     
     
       4. The signal receiving apparatus according to  claim 1 ,
 wherein the printed radiating conductor is formed in a winding shape. 
 
     
     
       5. The signal receiving apparatus according to  claim 1 ,
 wherein the conductive pattern and the printed radiating conductor formed on another side of the insulating substrate are arranged to serve as an antenna pattern that receives circularly polarized wave signals. 
 
     
     
       6. The signal receiving apparatus according to  claim 5 ,
 wherein the signal receiving circuit is used to receive radio signals including a detection signal obtained from a tire pressure sensor that detects a tire pressure of a vehicle, and 
 the receiving circuit board is mounted on the vehicle such that directivity of the radio signal received by the receiving circuit is in a direction connecting a grounded surface of the tire to the uppermost portion thereof.